Display.cpp

The sample code below shows how to render and display images via MV_CC_DisplayOneFrame() after getting the images.

#include <X11/Xlib.h> 
#include <assert.h>  
#include "math.h"

#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <pthread.h>
#include "MvCameraControl.h"

#define NIL (0) 

bool g_bExit = false;
Window g_hwnd;


// Wait for user to press "enter" key to end grabbing image or end the sample program
void PressEnterToExit(void)
{
    int c;
    while ( (c = getchar()) != '\n' && c != EOF );
    fprintf( stderr, "\nPress enter to exit.\n");
    while( getchar() != '\n');
    g_bExit = true;
    sleep(1);
}

bool PrintDeviceInfo(MV_CC_DEVICE_INFO* pstMVDevInfo)
{
    if (NULL == pstMVDevInfo)
    {
        printf("The Pointer of pstMVDevInfo is NULL!\n");
        return false;
    }
    if (pstMVDevInfo->nTLayerType == MV_GIGE_DEVICE)
    {
        int nIp1 = ((pstMVDevInfo->SpecialInfo.stGigEInfo.nCurrentIp & 0xff000000) >> 24);
        int nIp2 = ((pstMVDevInfo->SpecialInfo.stGigEInfo.nCurrentIp & 0x00ff0000) >> 16);
        int nIp3 = ((pstMVDevInfo->SpecialInfo.stGigEInfo.nCurrentIp & 0x0000ff00) >> 8);
        int nIp4 = (pstMVDevInfo->SpecialInfo.stGigEInfo.nCurrentIp & 0x000000ff);

        // Print current camera IP address and user-defined name
        printf("Device Model Name: %s\n", pstMVDevInfo->SpecialInfo.stGigEInfo.chModelName);
        printf("CurrentIp: %d.%d.%d.%d\n" , nIp1, nIp2, nIp3, nIp4);
        printf("UserDefinedName: %s\n\n" , pstMVDevInfo->SpecialInfo.stGigEInfo.chUserDefinedName);
    }
    else if (pstMVDevInfo->nTLayerType == MV_USB_DEVICE)
    {
        printf("Device Model Name: %s\n", pstMVDevInfo->SpecialInfo.stUsb3VInfo.chModelName);
        printf("UserDefinedName: %s\n\n", pstMVDevInfo->SpecialInfo.stUsb3VInfo.chUserDefinedName);
    }
    else if (pstMVDevInfo->nTLayerType == MV_GENTL_GIGE_DEVICE)
    {
        printf("UserDefinedName: %s\n", pstMVDevInfo->SpecialInfo.stGigEInfo.chUserDefinedName);
        printf("Serial Number: %s\n", pstMVDevInfo->SpecialInfo.stGigEInfo.chSerialNumber);
        printf("Model Name: %s\n\n", pstMVDevInfo->SpecialInfo.stGigEInfo.chModelName);
    }
    else if (pstMVDevInfo->nTLayerType == MV_GENTL_CAMERALINK_DEVICE)
    {
        printf("UserDefinedName: %s\n", pstMVDevInfo->SpecialInfo.stCMLInfo.chUserDefinedName);
        printf("Serial Number: %s\n", pstMVDevInfo->SpecialInfo.stCMLInfo.chSerialNumber);
        printf("Model Name: %s\n\n", pstMVDevInfo->SpecialInfo.stCMLInfo.chModelName);
    }
    else if (pstMVDevInfo->nTLayerType == MV_GENTL_CXP_DEVICE)
    {
        printf("UserDefinedName: %s\n", pstMVDevInfo->SpecialInfo.stCXPInfo.chUserDefinedName);
        printf("Serial Number: %s\n", pstMVDevInfo->SpecialInfo.stCXPInfo.chSerialNumber);
        printf("Model Name: %s\n\n", pstMVDevInfo->SpecialInfo.stCXPInfo.chModelName);
    }
    else if (pstMVDevInfo->nTLayerType == MV_GENTL_XOF_DEVICE)
    {
        printf("UserDefinedName: %s\n", pstMVDevInfo->SpecialInfo.stXoFInfo.chUserDefinedName);
        printf("Serial Number: %s\n", pstMVDevInfo->SpecialInfo.stXoFInfo.chSerialNumber);
        printf("Model Name: %s\n\n", pstMVDevInfo->SpecialInfo.stXoFInfo.chModelName);
    }
    else
    {
        printf("Not support.\n");
    }

    return true;
}

static void* WorkThread(void* pUser)
{
    int nRet = MV_OK;
    MV_FRAME_OUT stImageInfo = {0};
    MV_CC_IMAGE  stImage = {0};
   
    while(1)
    {
        nRet = MV_CC_GetImageBuffer(pUser, &stImageInfo, 1000);
        if (nRet == MV_OK)
        {
            if (g_hwnd)
            {
                stImage.nWidth = stImageInfo.stFrameInfo.nExtendWidth;
                stImage.nHeight = stImageInfo.stFrameInfo.nExtendHeight;
                stImage.enPixelType = stImageInfo.stFrameInfo.enPixelType;
                stImage.pImageBuf = stImageInfo.pBufAddr;
                stImage.nImageLen = stImageInfo.stFrameInfo.nFrameLenEx;
                MV_CC_DisplayOneFrameEx2(pUser,(void*)g_hwnd, &stImage , 0);
            }

            nRet = MV_CC_FreeImageBuffer(pUser, &stImageInfo);
            if(nRet != MV_OK)
            {
                printf("Free Image Buffer fail! nRet [0x%x]\n", nRet);
            }
        }
        else
        {
            printf("Get Image fail! nRet [0x%x]\n", nRet);
        }
        if(g_bExit)
        {
            break;
        }
    }

    return 0;
}

int main()
{     
    Display *dpy; 

    memset(&g_hwnd, 0, sizeof(Window));
    dpy    = NULL;


    // Open the connection to the display 0
    dpy = XOpenDisplay(NIL);

    if (NULL == dpy)
    {
        printf("please run with screan environment\n");
        return -1;
    }

    int whiteColor = WhitePixel(dpy, DefaultScreen(dpy));

    g_hwnd = XCreateSimpleWindow(dpy, DefaultRootWindow(dpy), 0, 0, 
        752, 480, 0, 0xffff00ff, 0xff00ffff);


    // Get MapNotify events (for changing window size)
    XSelectInput(dpy, g_hwnd, StructureNotifyMask);


    // Make the window display on the screen
    XMapWindow(dpy, g_hwnd);


    // Create a "Graphics Context"
    GC gc = XCreateGC(dpy, g_hwnd, 0, NIL);


    // Tell the GC to use the white color
    XSetForeground(dpy, gc, whiteColor);


    // Wait for the MapNotify event
    for(;;) 
    {
        XEvent e;
        XNextEvent(dpy, &e);
        if (e.type == MapNotify)
        {
            break;
        }    
    }        

    int nRet = MV_OK;

    void* handle = NULL;
    do 
    {
        // Initialize the SDK
        nRet = MV_CC_Initialize();
        if (MV_OK != nRet)
        {
            printf("Initialize SDK fail! nRet [0x%x]\n", nRet);
            break;
        }
        
        MV_CC_DEVICE_INFO_LIST stDeviceList;
        memset(&stDeviceList, 0, sizeof(MV_CC_DEVICE_INFO_LIST));


        // Enumerate devices
        nRet = MV_CC_EnumDevices(MV_GIGE_DEVICE | MV_USB_DEVICE | MV_GENTL_CAMERALINK_DEVICE | MV_GENTL_CXP_DEVICE | MV_GENTL_XOF_DEVICE, &stDeviceList);
        if (MV_OK != nRet)
        {
            printf("MV_CC_EnumDevices fail! nRet [%x]\n", nRet);
            break;
        }

        if (stDeviceList.nDeviceNum > 0)
        {
            for (int i = 0; i < stDeviceList.nDeviceNum; i++)
            {
                MV_CC_DEVICE_INFO* pDeviceInfo = stDeviceList.pDeviceInfo[i];
                if (NULL == pDeviceInfo)
                {
                    break;
                } 
                
                printf("[device %d]:\n", i);
                
                PrintDeviceInfo(pDeviceInfo);            
            }  
        } 
        else
        {
            printf("Find No Devices!\n");
            break;
        }

        printf("Please Intput camera index: ");
        unsigned int nIndex = 0;
        scanf("%d", &nIndex);

        if (nIndex >= stDeviceList.nDeviceNum)
        {
            printf("Intput error!\n");
            break;
        }


        // Select a device, and create a handle
        nRet = MV_CC_CreateHandle(&handle, stDeviceList.pDeviceInfo[nIndex]);
        if (MV_OK != nRet)
        {
            printf("MV_CC_CreateHandle fail! nRet [%x]\n", nRet);
            break;
        }


        // Turn on the device
        nRet = MV_CC_OpenDevice(handle);
        if (MV_OK != nRet)
        {
            printf("MV_CC_OpenDevice fail! nRet [%x]\n", nRet);
            break;
        }

        // Get optimal packet size, and set it for GigE cameras
        if (stDeviceList.pDeviceInfo[nIndex]->nTLayerType == MV_GIGE_DEVICE)
        {
            int nPacketSize = MV_CC_GetOptimalPacketSize(handle);
            if (nPacketSize > 0)
            {
                nRet = MV_CC_SetIntValueEx(handle,"GevSCPSPacketSize",nPacketSize);
                if(nRet != MV_OK)
                {
                    printf("Warning: Set Packet Size fail nRet [0x%x]!\n", nRet);
                }
            }
            else
            {
                printf("Warning: Get Packet Size fail nRet [0x%x]!\n", nPacketSize);
            }
        }
        

        // Start grabbing image
        nRet = MV_CC_StartGrabbing(handle);
        if (MV_OK != nRet)
        {
            printf("MV_CC_StartGrabbing fail! nRet [%x]\n", nRet);
            break;
        }

        pthread_t nThreadID;
        nRet = pthread_create(&nThreadID, NULL ,WorkThread , handle);
        if (nRet != 0)
        {
            printf("thread create failed.ret = %d\n",nRet);
            break;
        }

        PressEnterToExit();


        // End grabbing image
        nRet = MV_CC_StopGrabbing(handle);
        if (MV_OK != nRet)
        {
            printf("MV_CC_StopGrabbing fail! nRet [%x]\n", nRet);
            break;
        }


        // Turn off the device
        nRet = MV_CC_CloseDevice(handle);
        if (MV_OK != nRet)
        {
            printf("MV_CC_CloseDevice fail! nRet [%x]\n", nRet);
            break;
        }


        // Destroy the handle
        nRet = MV_CC_DestroyHandle(handle);
        if (MV_OK != nRet)
        {
            printf("MV_CC_DestroyHandle fail! nRet [%x]\n", nRet);
            break;
        }
        handle = NULL;
    }while (0);


    if (handle != NULL)
    {
        MV_CC_DestroyHandle(handle);
        handle = NULL;
    }

    // Deinitialize the SDK
    MV_CC_Finalize();

    printf("exit.\n");

    return 0;
}